Hydraulic control for pumps and the like



Dec, 30, 1941. R. B. TREER 'HYDRAULIC CONTROL FOR PUMPS A ND'THE LIKEFiled March 1 9, 1940 2 Sheets-Sheet 1 1NVENTOR. .S5 5. 77@@72 ATTORNEY.l

Dec. 30, 1941. R. B. TREER HYDRAULIC CONTROL FOR PMPS AND-THE'LIKE FiledMarch 19, 1940 2 Sheets-Sheet 2 INV ENTOR. ,055 726677 ATTORNEY.

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Patented 30, 1941 UNITED Is'riuli-:sl

PATENT OFFICE 2,268,000 HYDRAULIC CONTROL FOB PUMPS THE Ross B. Trcer,Lakewood,

Ohio. usino! of Ime- Ohio , half 'to Edwin J. Hull, Cleveland,

Application March 19, 1940, Serial No. 324,814

's claims.

My invention pertains to 'adjustable multiple impeller pumps and moreparticularly to a quick adjustable pump having ahydraulically operatedadjusting mechanism, and the present invention is an improvement on thepump disclosed in my copendlng patent application, Serial Number296,896, filed /28/39. and' the copending application of Edwin J. Hull,Serial Number 309,089,

illecl December 13, 1939.

` such a pump having a plurality of pump plungers .and guide passages.each plunger sliding into one end of an individual guide passage, a pairof ports opening into each guide'passage at axially spaced points, acheck vvalve plunger slidable into the opposite end of each guidepassage and appreaching the inner end of each pump plunger in theinter-port portion of the passage to positively prevent reverse flow ofiluid from the outlet port to the inlet port and to determinethequantity of iluid to be trapped in the interport passage by eachstroke of each pump plunger, biasing means urging each valve plunger tomove into said passage past the outlet port to positively cut oil re-Averse now oi.' iiuid therein from'the outlet port to the inlet port,stop means for limiting the move.- ment of each valve plunger into thepassage, means for adiustably supporting the stopmeans for movement tovarious positions to vadjustably limit the inward movement of said valveplunger by the biasing means to predetermine the quantity of liquidtrapped in the interport portion of the passage to be displaced by eachinward movement of the pump plunger, hydraulic actuator means for movingsaid stop means, conduit means, and control valve means associated withsaid conduit meansv and arranged for selectively increasing, holdingconstant or decreasing the pump capacity by selectively connecting thehydraulic actuator either to receive high pressure pumped iluid to movethe stop means to oppose .the movement of the valve plunger bythebiasing means, or to a neutral position to seal in received iluid, orto a position to open a discharge connection for discharging iluid fromthe hydraulic actuator in response to, pressure applied thereon by thevalve plunger biasing means.

(ci. 10s- 173) I Further objects and advantages are within the scope ofmy invention, such as relate tothe arrangement and function of therelated elements of the structure, to various details oi constructionand to combination oi parts. elements per se, and to economies ofmanui'acture'and to numerous other features as will be apparent 'from aconsideration of the speciiication in conjunction 'with the drawingsdisclosing a speclilc form ot my 1d invention, similar referencecharacters being applied to similar parts throughout, and, in which:Fig. 1 is a longitudinal sectional view through the quick adjustablemultiple impeller pump and with the manually actuable valve set Vforholding l5 the adjustment constant;

Fig. 2 is a similar view of a portion thereoi.| showing the manual valveset for injecting high pressure pumped fluid into the hydraulic actuatorfor increasing the pumping capacity. the conduit passages beingconnected to but one pumping unit instead of to a plurality of suchunits.

Fig. 3 is a similar'vlew of a portion thereof showing the manual valveset for releasing iluid from the hydraulic actuator to decrease thepumping capacity, the conduit passages being connected to butI onepumping unit instead of to a plurality of such umts.

Referring more particularly to Fig. 1 of the 3o drawings, my quickadjustable pump comprises a pump body I having an inlet port 3 and anoutlet port 5 opening into the body and intercep'ting" a cylindricalguide passage or bore 1 at axially spaced points thereof. 'I'he guidepassage I is drilled through the pump body I and the opposite ends ofthe passage open from opposite sidesof Y the body. The portion 9 of theguide passage 'I to the right oi' the inlet port 3 serves as a guidepassage for slidably receiving a pump plunger II 40 and the left handportion I3 to the left of the outlet port 5 serves as a guide passagefor a valve plunger I5 and the interport passage at times receives theinner ends of both plungers in a manner to be subsequently described.The intermediatek portion 'I of the guide passage may for convenience betermed the inter-port passage or it may-be regarded as a valve inletpassage since all the iluld approaches the valve plunger I5 through thispassage.

As Shown, another pair of ports 3 and 5 enter the opposite side of thepump body I in spaced` relation and similarly intercept a cylindricalguide passage 'I at'axial spaced points along the passage cooperatingwith a pump plunger II and a check valve plunger I5 in a similar manner.It

subsequently described. The outer ends of thev ports 3 and 5 may beprovided with any suitable pipeiitting arrangement for convenientconnection with pipe lines. y

A drive shaft I1 has one end journalled in a bearing I9. centrallydisposed-in the end of the pump body, and which may be of a frictionreiucing type having steel ball bearings 2|. 'I'he other end of thedrive shaft is journaled in a friction reducing bearing 23 centrallydisposed in an end cover plate 25 from whence the drive shaft isextended for connection with any suitable external source of power (notshown). The journalled portions of the drive shaft are in axialalignment and are connected through an intermediate portion 21 which isrelatively inclined for tilting a wobble collar 29 journalled thereon.as shown, and more fully described in my previously mentioned patentapplication. Similarly arms 3| extend laterally with projectingballconnectors 33 extending into U-shaped sockets 35 on the ends of thepump plungers II which are thereby reciprocated in the guide passages 9as the drive shaft |1 rotates. From the adjacent side of the pump bodylI a shell 31 extends, enclosing a chamber 38 around the drivingmechanism and has a thick internal flange 39 around the outer end towhich the cover plate 25 is attached by bolts 4I passing therethrough.Any suitable lubricant may be provided in the enclosing chamber forlubricating the driving mechanism of the pump.

. From the opposite side of the pump body, a shell 43 extends defining avalve chamber 44 which encloses the valves and the valve adjustingmechanism. A cover 45 is snugly secured to the outer edges of the shell43 as by bolts 41 passing therethrough. The cover 45 is provided with anaperture 49 in alignment with each valve plunger I5 and suitablythreaded for receiving a threaded plug 5|.. In the outside of each plug53 is a suitable aperture for receiving a wrench for screwing the pluginto or out of the cover. A. spring receiving recess 55 is provided inthe inner end of each plug 5| for receiving the outer end of acompression valve spring 5%1, the inner end of which presses against alateral flange 59 on the valve plunger I5 which is thereby continuously,biased to enter the valve guide passage I3. A guide pin 90 extends fromthe valve plunger I5 concentrically into the spring 51.

Stop means is provided for limiting the inward movement of the springbiased valve plunger I5 for which purpose I provide an adjustable stopmember or collar 9|. The stop collar 5| is of a generally circular orannular conformation having recesses 93 through which the valve plungersI5 slide freely until the inward movement of each plunger is limited bythe engagement of each .lateral flange 59 against the stop collar 5|.The

piston member 81 which projects thereinto from the central portion ofthe valve body I. The cylinder 95 of the stop collar 3| slides over thestationary piston 01 in snug iluid retaining relation and the latter hascircumferential packing receiving grooves 99 for receiving any suitablepacking material II therein to provide a snug fluid retaining seal.

Passing centrally through the stationary piston 81 Isa centralcylindrical bore 13 which extends into the center of the pump body I andconnects at the inner end through a passage 15 to one of the inlet ports3. Opening from the outlet port 5 is a passage 11 which intercepts thecentral bore 18 through an axially elongated slot 19 in the side wallthereof. Opening centrally through the stop collar 5I and cover 45 arecylindrical bores 8| and 83 in alignment with the central bore 13 in thebody and of a similar diameter. From the cylinder 85 in the stop collar5| a passage 85 extends and opens through the side wall of the centralbore 8| passing therethrough by way of two dlametrically opposed ports88 or a single semi-circular groove port.

A manual valve plunger 81 slides in snug fluid retaining relationthrough the central bores 83, 9| and into the central bore 13 in thevalve 'body I. From the inner end of manual valve plunger 81 twopassages 89 and 9| are drilled axially therein, the latter being closedby a plug 92 at its inner end. The axial passages 89 and 9| openoutwardly through ports 93 and 95 in the outer side wall of the portionof the manual valve plunger 81 which slides through the bore 8| in thestop collar 8| for conductive connection with the port 85 therein. Theports 93 and 95 open from the outer wall of the manual' valve plunger 81at axially spaced points therealong such that either passage 89 or 9|may be conductively convslot port 19 in all positions of the plunger forcontinuously applying the high pressure pumped iiuid therein from theoutlet port 5.

a link |03 extending plvotally from a pivot pin |02 in a bracket member|04 on the cover 45. The outer end of the manual control valve plunger81 is connected to an intermediate portion of' .the hand lever 99 by apivot pin |05. The operator grasps the upper end of the hand lever andbecause of the leveragev obtained easily moves the manual control valveplunger 91 in or out of the pump to quickly and conveniently adjust theper stroke pumping.

In operation thedrive shaft I1 is rotated by any external source ofpower causing the pump plungers I| to reciprocate in the guide passagesl in a m'anner more fully described in my copending patent applicationpreviously mentioned. As a pump plunger moves to the right out of theinter-port passage, fluid rushes in from inlet port 3 to fill the spaceevacuated by the plunger. Moving to the left, the inner end of the pumpplunger starts to enter the adjacent end of the inter-port passage 1trapping therein-a quantity of fluid which is then pushed forcefullyalong, moving the check valve plunger to the left, openassenso te theduties t and discharging there from; As the pump plunger il moves in theright, the check valve plunger follows and, enter'-,

ing the other end oi' the inter-port passage 1, positively restricts thereverse ow of fluid from' the outlet port through passage 1 toward theinlethport 3. The distance that the inner end of the valve plungerenters into the inter-port passage 1 determines the quantity of liquidthat will be trapped therein by the next inward move,- ment of. the pumpplunger and this is determined by the position of the stop collar 9iwhich by engagement .with nange 59 on the valve plunger limits itsextreme inwardmovement.

' To conveniently and quickly adjust the stroke by stroke pumpingcapacity of the pump plungers to suit all conditions oi' demand and ofthe density and viscosity of diiferent liquids to be dispensed. it isonly necessary for the attendant to shift the hand lever 99. l

To increase the capacity of the pump, the lever 99 is moved to the leftto draw the manual control valve plunger 91 to the left until port 9B"therein is conductively connected with the port 96 in the stop collarBI, as shown in Fig. 2. when high pressure pumped fluid ows from outletpassage 9 by way of passage' 11, slot port 19, plunger port 91, plungerpassage 9|, plunger port 95, stationary port 89, and thence by way ofpmage 95 into the cylinder 99. As the high and the present disclosure isillustrative merely,

the invention ccmprehending all variations' and an outlet port openinginto each guide paspressure pumped fluid enters the cylinder 89 in thestop collar 8l, the entire stop collar is caused to slide back on thestationary piston support memberl 91 thereby engaging all the lateralanges 59 on all the sliding valve plungers I5 atan earlier point ofthe'inward movement thereof. The inner ends of the valve plungers muststill enter the adjacent ends of the interport passages 1 to serve theirfunctions as check valves, but because of not entering so far into theinterport passages a larger quantity of liquid is received therein to beadvanced by the next inward movement of the respective pump plungers.

When the pump capacity has been suillciently increased, the lever 99 isactuated to move the control valve plunger 91 to the neutral positionwhen the plunger ports 93 and 95 are disposed l as shown in Fig. 3, onopposite sides of the stationary port, 86, which is thus closed to sealin the cylinder 95 the liquid received therein. 0r as the stop collar Elmoves to the left, POlhs 93 and 95 are automatically disposed onopposite sides of port 88. In the neutral position of the lever 99, theadjustment of the pump is held constant.

When it is desired to adjust the pump to decrease the pumping capacityof each pump' plunger, the lever 99 is moved to the right moving thecontrol valve plunger-91 to the right until the plunger port 99conductively connects with the stationary port 89, as shown in Fig. 3.In this position the iluid previously injected into sage at. axially'spaced points therein, a pump plunger slidable back and forth in fluiddisplac-l ing relation in the end of each guide passage adjacent theinlet port for opening and closing the inlet port and for movingentrapped iluid through the interport passage'toward the outlet port, adrive shatt'journalled substantially centrally with reference to thecylindrical arrange- 'ment of the guide passages in the pump block,power transmission means operatively connecting between said drive shaftand the pump plungers stop member for movement to simultaneouslyadjustthe innermost position of all saidvvalve plungers to fpredetermine the'quantity of entrapped liquid in the interport portion of eachl passageto be displaced by each inward movement of each pump plunger, ahydraulic actuator for moving said stop member, conduit means. andcontrol valve means conductively connected with said hydraulic actuatorand said conduit means and arranged for selectively operating 'saidhydraulic actuator to move the stop member in either direction. or tohold stationary.

2. A compact adjustable capacity multiple impeller pump comprising, apump block, a plurality of guide pwsages in said pump block and openingtherefrom at the opposite ends, said guide passages being disposedsubstantially parallel to each other in a substantially cylin-` dricalarrangement in said pump block, an inlet port and -an outlet portopeninginto eachguide' passage at axially spaced points therein, a pump plungerslidable back and forth in fluid displacing relation in the end of eachguide passage adjacent the inlet port for opening and closing Athe inletport and for moving entrapped nuici` through the interport passagetoward the outlet port, a check valve plunger slidably disposed in theother end of, each guide passage adjacent the outlet port for opening orclosing the outlet the cylinder escapes by way of passage' 85, v

ports 96 and 93, axial passage` 99 in the plunger 81, into the 'centralbore 13 at the inner end of the control plunger 91, thence by way ofpassage 15 in the pump body to the low pressure inlet port 9. Thetension of all the compression valve springs 51 pushes'the stop collarmember 6I to the right expelling uid from the cylinder 65 Auntil thehand lever 99 is again moved to a neutral position. l

It is apparent that within the scope of the invention, modifications anddifferent arrange-y ments may be made other than therein disclosed,

port, a valve spring for continually biasing each A valve plunger intothe guide passageto move in past' the outlet port and into the interportpassage, .a stop collar havingA apertures through which the valveplungers slide, engageable means4 displaced by each inward movement ofeachpump plunger by adjusting the extent of the insertion of the innerendoi each valve piston into the inter-port passage,'a hydraulicactuator i'or shifting said stop collar, conduit means, and manuallymovable control valve means conductivelyconnected with said hydraulicactuator and Y said conduit means and arranged for ,selectivelyoperating said hydraulic actuatory toinovejthe stop collar in eitherdirection. 3. The combination with a multiple impeller pump comprising,a pump block having a plurality of guide passages, an inlet port and anoutlet port opening at axially spaced points into an intermediateportion .of each passage, a pump" quantity of fluid to be trapped in theintermediate portion of each passage between the inlet and outlet portconnections, oi' means for controlling the pumping capacity of all ofthepumps simultaneously comprising an engageable means on each valveplunger, an apertured stop collar through which the valve plungers passfor engaging the engageable means for limiting the inward movement ofeach spring pressed valve plunger, a piston projection extendingcentrally from the pump body toward the stop collar, a central cylinderrecess in the stop collar for receiving said piston projection inslidable iiuid retaining relation therein for` supporting said stopcollar for movement to various positions relative to the pump block topredetermine the inner extreme position of the valve plungers foradjusting the quantity of entrapped liquid in the interport portion ofeach passage to be displaced by each inward movement of each pumpplunger,

said cylinder recess and piston projection forming a hydraulic `actuatorfor moving said stop collar, conduit means, and control valve meansconductively connected with said cylinder recess and said conduit meansand arranged-for selectively connecting the cylinder recess with thepump inlet or outlet or for disconnecting it from either.

4. A compact adjustable -multiple impeller pump comprising thecombination set forth in claim number 3 in which the control valve meansincludes a manually actuable control valve plunger sliding throughcentral apertures in said stop collar and the piston projection, andconduit means controlled thereby including passages extending along inthe plunger and opening laterally from the sides o! the plunger forselectively connecting conductively with and between the cylinder recessand the inlet and outlet passages in the pump body.

5. A compact adjustable capacity multiple impell'er d pump comprising, apump block, a pluralityfoi' guide passages, in` said pump block andpening therefromfat' the opposite ends saldi guide passagesbeing'disposdsupstantiauy parellf lel wgeach ether-1h; a; substantiallyr1ind1c`1'- arrangemen*tA inj'said pump" block'lf-an xinlet port and anoutlet port'opening into each guide passage at axially spaced` pointstherein, a pump plunger slidable back and forth in uid displacingrelation in the end oi' each guide passage adjacent the inlet port foropening and closing the inlet port and for moving entrapped fluidthrough the interport passage toward the outlet port, a drive shaftjournalled substantially centrally with reference to the cylindricalarrangement oi the guide passages in the pump block, power transmissionmeans operatively connecting between said drive shaft and the pumpplungers for reciprocating the plungers as the shaft rotates, a checkvalve plunger slidahly disposed in the other end of each guide passageadjacent the outlet port for opening and closing the outlet port, avalve spring for continually biasing each valve plunger into the guidepassage to move in 'past the outlet port and into the interport passage,an engageable projection on each valve plunger, a generally annular stopcollar having apertures throughV which the valve plungers slide forengaging said projection thereon for limiting the movement of eachspring pressed valve plunger into each passage, supporting means foradjustably supporting said stop collar for movement to various positionsrelative to the pump block to predetermine the quantity of entrappedliquid in the interport portion of each passage to be displaced by eachinward movement of each pump plunger by adjusting the extent of theinsertion of the inner end oi' each valve piston into the inter-portpassage, said supporting means also serving as a hydraulic actuator formoving said stop means, conduit means, and control valve meansconductively connected with said hydraulic actuator and said conduitmeans and arranged for selectively increasing, holding constant, ordecreasing the capacity of said pump.

ROSS B. 'FREEB-l

